Earlier quoted context omitted.
If a candidate can’t give a good-quality written answer to a job-related question when given several hours or days, would you really want to rely on them to provide usable bug/feature descriptions or documentation later, when they have other time pressures?
Maybe the candidate realizes they are in high demand and don't need to waste time. I wont interview/apply at some notorious companies because I know I can get an equal offer without jumping through hoops. So you lose out on the highest demand candidates and get the most desperate candidates.
Wonderful! Saves us all time, money and frustration!